NC2101™ series double-wall carbon nanotubes are produced via the Catalytic Chemical Vapor Deposition (CCVD) process. Nanotubes which exit the reactor are then purified to greater than 90% carbon. Finally, it is functionalized with COOH to produce the 2101 grade. These products are available in 1 g to 1 kg order quantities. A primary interest is in applications requiring high field emission characteristics, transparency or high surface area.